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I'd ignore their sizing and size guidelines, I spent ages second guess what size I should get, I'm only 5,11 so should be riding medium, but after a test ride and have comparing the top tube and seat tube length to my current bikes I got a large and even then I'm running a 120 stem and a lay back set post to get a comfortable position.
That being said not everybody is going to want to have a flat back and a slammed stem on there cargo bike.
I would guess your going to be right between a medium and a small.
Updated website with new products looking good. Can hopefully be able to order a Cargo soon from them...
https://omniumcargo.dk/omnium-cargo/